following yaml line of code (Code is at line 10 and line 9 and 11 through 13 are blank where the yaml ends)
bibliography:dcf_bibliography.bib
when knitting to PDF format which knits fine without the line of code
results in this error
messageError in yaml::yaml.load(..., eval.expr = TRUE) : Scanner error: while scanning a simple key at line 9, column 3 could not find expected ':' at line 12, column 5 Calls: <Anonymous> ... parse_yaml_front_matter -> yaml_load -> <Anonymous> Execution halted
There is a space missing after the colon. Fix it like this:
bibliography: dcf_bibliography.bib
It is not certain this is the only error as you don't show the whole YAML file.
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